Eurnace



C. C. LODER.

FURNACE.

APPLICATION FILED MAR- 3. H9.

1,325,522. Patented Dec. 23, 1919.

2 SHEET$ SHEET I.

MK$ZZNTOR1 C. C. LODER.

FUR-N'ACE.

APPLICATION FILED MAR-3.1919.

s 3 DH E m 2 m UNITED sTATEs PATENT oEEIoE.

CHARLES C. LODER, F DAYTON, KENTUCKY, ASSIGNOR 0F ONE-FOURTH TO GUSTAV HAFFNER, ONE-FOURTH T0 LOUIS HAFFNER, AND ONE-FOURTH TO EDWIN I-IAFF- FURNACE.

Application filed March 3, 1919.

To all whom it may concern:

Be it known that 1, CHARLES C. LoDER, a citizen of the United States of America, and a resident of Dayton, in the county of Campbell and State of Kentucky, have invented a new and useful Improvement in Furnaces, of which the following is a specification.

My invention relates to that class of fur naces, which are divided by a central diaphragm into two combustion chambers for the flow of gases, communication between which may be had between the grate bars and the diaphragm.

An object of my invention is to provide a furnace of this class, in which heated air is supplied to the partly consumed gases in their passage from one combustion chamber to the other, so that as the heated gases and the air pass up through the glowing coals in the other chamber perfect combustion of the gases is had.

Another object of my invention is to provide a means for regulating the supply of air to the furnace.

Another object of my invention is a ready means for changing the direction of the passage of gases from the furnace to the flue.

Another object of my invention is to provide a furnace of this kind with a diaphragm section which may be readily installed in a furnace.

These and other objects are attained by the means described in the specification and illustrated in the accompanying drawings, in which Figure 1, is a perspective view of a hot air furnace embodying my invention, parts of the air jacket and the body being shown broken away, and the partition or diaphragm being shown partly in section.

.Fig. 2, is a central transverse sectional view of the same.

Fig. 3, is a detail side elevation of the diaphragm.

Fig. 4c, is a top plan view ofthe diaphragm.

Fig, 5, is a front elevation of the auxiliary V diaphragm which supplies air to the diaphragm.

Fig. 6, is a detail front elevation of the diaphragm and of the dampers which regulate the direction of the passage of air to the smoke box.

Fig. 7, is a detail front elevation of the furnace and of the furnace doors.

Specification of Letters Patent.

Patented Dec. 23, 1919.

Serial No. 280,272.

Referring to the parts; body A of the furnace is surrounded by the usual housing A, for forming the hot air jacket around the furnace body. Within the ash pit A twin grate bars A*, A are pivotally mounted upon a common support rod A, so that they may be independently shaken by means of links A A which are connected to handles upon the front of the housing A. The body of the furnace has a fuel feed opening, which is connected by means of a fuel feed box A with the front of the housing A. The body of the furnace has extending from its top to within a short'distance'from the grates, a diaphragm which divides the body of the furnace into two combustion chambers A A The dis-' tance between the lower end of the diaphragm and the grates is such as to leave room for a shallow bed of coals. In the upper part of the body of the furnace is a rectangular opening which is surrounded by a smoke box G, which connects with the flue. The diaphragm is arranged centrally of the opening in the top of the furnace and the communication between the furnace and the smoke box is controlled by two dampers H, H, which are coupled together so that when one is closed the other one is open. When first fuel is fed upon the fire in the furnace, it is placed in the combustion chamber whose damper is closed. This forces the gases to flow down below the diaphragm and into the other combustion chamber, being combined in its passage with the heated air supplied by the diaphragm, and thence through the open damper to the smoke chamber.

I will now describe the details of the construction of the parts.

The diaphragm is composed of support plates 0, 0 whose upper edges are curvedto fit the dome of the body of the furnace to which it is secured by bolts 0 The plates have reduced upper ends which fit within the flange a which surrounds the opening in the topof the body of the furnace. Plate 0 has flanges a which overlap the inner edge of plate 0. To the lower edges of plates 0, 0', aresecured plates 0, 0 c 0 the overlapping edges of the plates 0, 0" and plates 0 0 are rabbeted and the edges overlap a sufficient distance to permit of an expansion of the plates under heat. The inner faces of these plates carry lugs 110 the other combustion chamber.

which space plates 0*, c from plates 0 0 so as to form an air space 0 between them. The outer edges of plates 0 0 c 0 con tact closely with the walls of the body of the furnace. The lower edges of these plates have substantial semicircular flanges 0, 0 0 0 which form ways to receive the beads upon the upper ends of plates 0 0 0 0 The inner edges of plates 0, c, 0 0 likewise are rabbeted similarly to plates 0 -0 The lower edges of plates 0 0 0 0 have in them a series of notches 0 Plates 0 and 0 are spaced from plates 0 0 so as to leave between them an air chamber 0 which is in alinement with the air chamber 0 The lower sides of the diaphragm fit between lugs a, a which project inward from opposite sides of the fire pot, as shown in Fig. 2.

Centrally located of the fuel feed box A is an auxiliary diaphragm, which is composed of plates E, E, between which is formed an air chamber 6 which communicates with the air chamber a at one end, and at the outer end communicates with the external air by an opening 6, the opening and closing of which is controlled by a slide 6 in the front wall of the box A Plates E, E, have at their rear ends flanges e, which overlap the front edges of plates 0 0 Plates E, E are held together by lugs 6 6 The auxiliary diaphragm divides the fuel feed box A into two fuel feed passages, access to which is had by doors F, F.

.Llounted upon top of the body of the furnace and surrounding the flange a is a cylindrical smoke box G, which communicates with the pipe G which leads to the flue.

The opening between the smoke box and the body of the furnace is divided in two by the main diaphragm. In said openings are mounted dampers H, H. The dampers .are mounted upon the longitudinal rods it, h, which extend through the walls of the smoke box and receive upon their outer ends gears if, h which are in mesh with a central gear wheel 71*, which is secured upon a rod 71 which is journaled in the smoke box and the flange a extends through a housing A and receives upon its end an arm it by means of which the gear wheels 7L2, h h

may be rotated to change the position of the dampers H, H, which are so positioned upon their mounting rods that when one is closed the other is open.

In operation the diaphragm of the combustion chamber, in which the fresher fuel is located, is kept closed. Therefore the gases therefrom must seek an outlet to the flue by passing beneath the diaphragm into The slide 9 being open, air passes through the opening 6 into the air chamber 6 of the auxiliary diaphragm thence into the air chamber 0 thence downward between the plates 0, 0 0 0 and is mixed with the gases passing beneath the diaphragm The air in its passage through the auxiliary diaphragm and the main diaphragm, is heated by the walls thereof so that it is in condition to assist in the combustion of the gases as they pass upward through the red coals in the second combustion chamber. After the coals in the first combustion chamber have been somewhat consumed, fresh fuel is placed in the second combustion chamber, and the dampers H, H, are reversed in their positions so that the flow of gas passes downward from the second combustion chamber and into the first combustion chamber.

To prevent the coal from forming a seal against the passage of air, along the lower edge of plates 0 c I have placed a series of lugs 0 which assist the notches 0 in forming air passages.

Air is to be admitted above the fuel into the combustion chamber from which the flow of gas is taking place. The admission of this air may be had by means of rotating slides f in the furnace doors F, F. These rotating slides are of the ordinary construction such as commonly used for regulating admission of air through furnace doors, and need not therefore be more specifically described. The slides f in the door of the fuel passage leading to the combustion chamber, through which the gases are passing upward to the smoke box, are kept closed.

What I claim is 1. In a furnace the combination of a furnace body, a diaphragm with imperforate sides and dividing the body of the furnace into combustion chambers and having in it an air chamber which communicates at its lower end with the combustion chambers, means for admitting external air to the air chamber, and dampers adapted to cause the gases from either combustion chamber to flow beneath the diaphragm and into the other combustion chamber.

2. In a furnace the combination of aftirnace body having an opening in its top, a smoke box covering and encircling the opening, a central diaphragm extending into the opening, contacting with opposite walls of the body of the furnace and terminating at a distance above the grates, dividing the furnace into two combustion chambers, and having in it an air passage adapted to discharge air into the space below it and dampers located in the opening in the top of the furnace and adapted alternately to close the communication between one combustion chamber and to open communication between the other combustion chamber and the smoke box and vice versa.

3. In a furnace the combination of a furnace body a central diaphragm therein comprising plates contacting with and secured to the top of the furnace body, two sets of lower plates secured upon each side of the first mentioned plates and adapted to form an air chamber between them, said plates having at their lower ends curved flanges and two sets of plates having beads mounted in the flanges and adapted to form an air passage leading from the air chamber into 1 the space below the diaphragm.

4. In a furnace the combination of a furnace body a housing surrounding the furnace body and forming a hot air chamber therewith, a furnace body having fuel feed openings in its side and an opening in its top for the discharge of gas, a fuel feed box contacting with the body surrounding the fuel feed opening and extending through. the housing, a smoke box mounted upon the furnace body and surrounding the discharge opening in its top, a diaphragm dividing the furnace body into two combustion chambers and having therein a central passage discharging into the space below the diaphragm, an auxiliary diaphragm extending s from the diaphragm through the fuel feed box and having therein an air passage extending from the front of the furnace to the air passage in the diaphragm, fuel feed doors in the feed box and upon each side of the diaphragm, dampers in the furnace top adapted to regulate the flow of gas from the combustion chambers to the smoke box and means for moving the dampers.

5. In a furnace the combination of a furnace body, a diaphragm dividing the body into two combustion chambers and having in it an air passage, the lower edge of the diaphragm being serrated and having a series of lugs adjacent to the serrations and adapted to cooperate with the serration to form air passages through the fuel.

In testimony whereof, I have hereunto subscribed my name this 27th day of February, 1919.

CHARLES C. LODER. 

